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Elimination of SAS interferences in catalytic adsorptive stripping voltammetric determination of Cr(VI) by means of fumed silica

机译:气相二氧化硅消除催化吸附溶出伏安法测定Cr(VI)中的SAS干扰

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In the work the procedure of chromium(VI) determination by catalytic adsorptive stripping voltammetry (CAdSV) with application of fumed silica, is presented. Two variants of the method are proposed: in the first fumed silica is put directly to the electrolytic cell containing tested solution, in the second the silica is shaken with the sample and next centrifuged. The effectiveness of many surface-active substances removal from synthetic solutions as well as natural water samples, is studied. In the experiments the fumed silica (Sigma-Aldrich) of the specific surface area in the range 200-390 m(2) g(-1) was used. Two types of the working electrodes were applied, i.e., hanging mercury drop electrode (HMDE) and cyclic renewable mercury film electrode (Hg(Ag)FE). In the silica presence i) the relative standard deviation (RSD) for 0.1 mu g L-1 Cr(VI) is <2% (HMDE) and <5% (Hg(Ag)FE), n=7, ii) the detection limits estimated deposition time 20 s were respectively 14 ng L-1 (HMDE) and 22 ng L-1 (Hg(Ag)FE). The accuracy of the method was tested by studying the recovery of Cr(VI) from spiked natural water samples.
机译:在工作中,提出了使用气相法二氧化硅通过催化吸附溶出伏安法(CAdSV)测定铬(VI)的程序。提出了该方法的两个变体:在第一种方法中,将气相法二氧化硅直接放入含有测试溶液的电解池中,在第二方法中,将二氧化硅与样品一起摇晃,然后离心。研究了从合成溶液以及天然水样品中去除许多表面活性物质的有效性。在实验中,使用比表面积为200-390 m(2)g(-1)的气相二氧化硅(Sigma-Aldrich)。使用两种类型的工作电极,即悬挂式汞滴电极(HMDE)和循环可再生汞膜电极(Hg(Ag)FE)。在二氧化硅的存在下,i)0.1μg L-1 Cr(VI)的相对标准偏差(RSD)<2%(HMDE)和<5%(Hg(Ag)FE),n = 7,ii)检测极限估计的沉积时间20 s分别为14 ng L-1(HMDE)和22 ng L-1(Hg(Ag)FE)。通过研究加标天然水样品中六价铬的回收率,测试了该方法的准确性。

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